CN108662910B - Method for producing Taixipu calcined coal and electric calcined coal by utilizing graphitized waste heat to replace calcining furnace - Google Patents
Method for producing Taixipu calcined coal and electric calcined coal by utilizing graphitized waste heat to replace calcining furnace Download PDFInfo
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- CN108662910B CN108662910B CN201810460331.1A CN201810460331A CN108662910B CN 108662910 B CN108662910 B CN 108662910B CN 201810460331 A CN201810460331 A CN 201810460331A CN 108662910 B CN108662910 B CN 108662910B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/205—Preparation
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/08—Heating by electric discharge, e.g. arc discharge
- F27D11/10—Disposition of electrodes
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Abstract
The invention provides a method for producing Taixi ordinary calcined coal and electric calcined coal by utilizing graphitization waste heat to replace a calciner, which comprises the steps of charging and graphitization, wherein a heat preservation material is cleaned Taixi anthracite during charging; the washed Taixi anthracite is used as a heat preservation material and is also heated to 800 ℃ or 1800 ℃ by the waste heat of graphitization, thus finishing calcination and converting into calcined anthracite.
Description
Technical Field
The invention relates to the technical field of application of resistance furnaces, in particular to a method for producing Taixipu calcined coal and electric calcined coal by utilizing graphitized waste heat to replace a calcining furnace.
Background
Anthracite is generally the main raw material of carbon refractory (carbon block and bottom paste) used for building the inner lining of blast furnaces, electric furnaces and aluminum electrolysis cells in metallurgical industry because of its low price, high carbon content and compact structure. However, before the anthracite coal is used, the anthracite coal must be calcined to remove volatile components, so that the resistivity of the anthracite coal is reduced, and the heat conducting property and the true density of the anthracite coal are improved. The main coal used at present is ordinary and electrically calcined anthracite.
The common calcined anthracite is calcined or dried at high temperature of about 500-.
In the patent of application No. 201610411989.4, in order to overcome the problem of large voltage and low current of the transformer for silicon carbide furnace, the method for producing graphitized material is to increase the heat generation of resistance material by increasing the resistivity of resistance material, so as to graphitize the core material.
Meanwhile, the furnace core is insulated by adopting an insulation material, the insulation material in the prior art is calcined petroleum coke or a mixture of metallurgical coke and quartz sand, the calcined petroleum coke is high in price, the use cost is high, and the caking rate of the petroleum coke is low. However, the overall idea of the above patent application No. 201610411989.4 is to use these insulating materials to insulate the furnace core material in order to assist the graphitization of the negative electrode material, that is, these resistance materials and insulating materials are designed for the graphitization of the negative electrode material, so that the graphitization cost is high and the added value is low.
Disclosure of Invention
There is a need for a method for producing taixipu calcined coal and electric calcined coal by using graphitized waste heat instead of a calcining furnace.
A method for producing Taixipu calcined coal and electric calcined coal by utilizing graphitized waste heat to replace a calcining furnace comprises the following steps:
laying a furnace bottom heat-insulating layer in the furnace body, laying a lower cushion resistance material on the furnace bottom heat-insulating layer, placing a crucible on the lower cushion resistance material, and placing a cathode material to be graphitized in the crucible;
laying electric resistance materials in a furnace core around the crucible to cover the crucible;
laying a heat preservation material on the surface of the resistance material; wherein the heat-insulating material is finely washed Taixi anthracite;
graphitization: the industrial high-voltage electricity is connected into a transformer for a silicon carbide furnace, the positive electrode and the negative electrode of direct current after transformation and rectification are respectively connected with the positive electrode and the negative electrode of a furnace body, and power transmission, temperature rise and graphitization are started.
In the invention, in the process of producing the graphitization of the cathode material by utilizing the eliminated transformer for the silicon carbide furnace and the matched resistance furnace, the resistance material containing the finely washed Taixi anthracite is used as a heating body, and the finely washed Taixi anthracite is used as a heat preservation material; the washed Taixi anthracite is used as a heat preservation material and is also heated to 800 ℃ or 1800 ℃ by the waste heat of graphitization, thus finishing calcination and converting into calcined anthracite.
The graphitizing temperature of the furnace core can reach 3000 ℃, the temperature of the inner layer heat preservation material can reach 1800 ℃, the washed Taixi anthracite on the layer is calcined to reach the level of electric calcining of the electric calcining furnace, the temperature of the outer layer heat preservation material can reach 800 ℃, the washed Taixi anthracite on the layer is calcined or dried to reach the level of calcining of the common calcining furnace, so that the aim of calcining the heat preservation material is fulfilled while the furnace core material is graphitized, and the washed Taixi anthracite can be calcined without independently and specially setting a common calcining or electric calcining process to reach the level of calcining coal.
The parameters of the transformer used for the silicon carbide furnace are 12500KVA, 630V of maximum output voltage and 45000A of maximum output current, while the conventional Acheson graphitizing furnace has small voltage and large current, the maximum output voltage is about 200V and the maximum output current is 60000A.
According to the requirements in the industrial structure adjustment guidance catalog published by the State development and reform Commission in 2013 of China, the transformer for the silicon carbide furnace which is eliminated from being idle and the kiln matched with the transformer can be reformed by adopting the method.
Drawings
FIG. 1 is a schematic view of the charging structure of a graphitization furnace using the method of the present invention.
In the figure: a furnace bottom heat-insulating layer 11, a lower cushion layer resistance material 12, a drainage layer 13, a resistance material 14, an inner layer heat-insulating material 15, an outer layer heat-insulating material 16 and a crucible 20.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Referring to fig. 1, an embodiment of the present invention provides a method for producing taixipu calcined coal and electric calcined coal by using graphitized waste heat instead of a calciner, including the following steps:
laying a furnace bottom heat-insulating layer 11 in the furnace body, laying a lower cushion layer resistance material 12 on the furnace bottom heat-insulating layer 11, placing a crucible 20 on the lower cushion layer resistance material 12, and containing a negative electrode material to be graphitized in the crucible 20;
laying an electric resistance material 14 in the core around the crucible 20 to cover the crucible 20; the electric resistance material 14 is a mixture of fine-washed Taixi anthracite and low-sulfur petroleum coke;
laying heat preservation materials on the surface of the resistance material 14;
graphitization: the industrial high-voltage electricity is connected into a transformer for a silicon carbide furnace, the positive electrode and the negative electrode of direct current after transformation and rectification are respectively connected with the positive electrode and the negative electrode of a furnace body, and power transmission, temperature rise and graphitization are started.
In the prior art, because the resistivity of the finely washed anthracite is very high, when the finely washed anthracite is used as the resistance material 14, the problem that the furnace body is dead due to too large resistance caused by power supply and temperature rise of the furnace body is solved, and particularly, for the invention, a transformer for a silicon carbide furnace is adopted, and the current output by the transformer is originally smaller than the current output by other graphitizing furnaces or transformers matched with Acheson furnaces, so that the problem that the circuit cannot be continuously conducted and the furnace is dead due to the fact that the finely washed anthracite is singly used as the resistance material 14 is solved.
Therefore, in the invention, for additional production of coal-based graphite, the finely-washed Taixi anthracite is doped into the low-sulfur petroleum coke with low resistivity, compared with the scheme of singly adopting the low-sulfur petroleum coke as the resistance material, the doped finely-washed Taixi anthracite can improve the resistivity of the mixed resistance material 14, the furnace resistance is increased in the later stage of continuous power supply of the transformer, and the problems that the resistance material cannot continuously transmit power because of low resistance, the temperature cannot continuously rise and the temperature cannot meet the temperature requirement of graphitization are avoided; compared with the scheme of singly adopting the finely washed Taixi anthracite as the resistance material, the mixed low-sulfur petroleum coke can reduce the resistivity of the mixed resistance material 14, improve the conductivity, play a role in reducing the furnace resistance of the furnace core in the early stage of power transmission, promote the rapid temperature rise of the furnace core and reach the graphitization temperature. Meanwhile, the finely washed Taixi anthracite can also reach the graphitization temperature to obtain the coal-series graphite.
Further, the average particle size of the fine washed taixi anthracite coal in the electric resistance material 14 is larger than the average particle size of the low sulfur petroleum coke.
Because the specific resistance of the washed Taixi anthracite is greater than that of the low-sulfur petroleum coke, and the smaller the particles are for the stacked materials, the larger the resistance is, by utilizing the principle, the scheme that the granularity of the washed Taixi anthracite is greater than that of the low-sulfur petroleum coke is provided in the invention, so that the resistivity of the anthracite is reduced and the resistivity of the petroleum coke is improved by adjusting the granularity between the washed Taixi anthracite and the low-sulfur petroleum coke, the resistivity balance of the petroleum coke and the low-sulfur petroleum coke is realized, and the electric resistance material 14 containing the two materials has uniform conductivity and no sudden change in temperature.
Further, the ratio of the low-sulfur petroleum coke to the washed Taixi anthracite is 6-7: 3-4.
Further, the resistance material 14 mixture graphitized by the furnace body is screened and separated to obtain the coal-based graphite.
The design ideas of different particle sizes adopted by the resistance material 14 mixture can realize material separation, and the single coal-based graphite without impurity doping can be obtained.
Further, a drainage layer 13 is arranged between the resistance material 14 and the heat insulation material, and the resistivity of the drainage layer 13 is smaller than the resistivity of the resistance material 14 and the heat insulation material, so as to be used as a current passing area in the initial stage of power transmission and temperature rise.
Further, the heat preservation material is finely washed Taixi anthracite.
Further, the heat insulation material comprises an inner layer heat insulation material 15 and an outer layer heat insulation material 16, the inner layer heat insulation material 15 and the outer layer heat insulation material 16 both adopt washed Taixi anthracite, and the granularity of the outer layer heat insulation material 16 is smaller than that of the inner layer heat insulation material 15, so that the heat insulation performance of the outer layer heat insulation material 16 is superior to that of the inner layer heat insulation material 15. The granularity of the inner-layer heat-insulating material 15 is 2-8mm or 5-9mm, and the granularity of the outer-layer heat-insulating material 16 is 0-1 mm.
According to the scheme, the characteristics of large specific resistance, high heating degree and slow heat dissipation of the washed Taixi anthracite are fully utilized, in the process of electrifying and heating the furnace body, the temperature of the resistance material 14 in the furnace core is increased to be not less than 2900 ℃, the temperature of the inner layer heat preservation material is increased to be not less than 1800 ℃, the temperature of the outer layer heat preservation material is increased to be not less than 800 ℃, the temperature and the requirements of a common calcining furnace or an electric calcining furnace for calcining the washed Taixi anthracite are completely met, the negative electrode material in the crucible 20 is graphitized, the washed Taixi anthracite in the resistance material 14 is changed into coal-based graphite, and meanwhile, the inner layer heat preservation material and the outer layer heat preservation material are synchronously calcined. The modules or units in the device of the embodiment of the invention can be combined, divided and deleted according to actual needs.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (4)
1. A method for producing Taixipu calcined coal and electric calcined coal by utilizing graphitized waste heat to replace a calcining furnace is characterized by comprising the following steps:
laying a furnace bottom heat-insulating layer in the furnace body, laying a lower cushion resistance material on the furnace bottom heat-insulating layer, placing a crucible on the lower cushion resistance material, and placing a cathode material to be graphitized in the crucible;
laying electric resistance materials in a furnace core around the crucible to cover the crucible; the electric resistance material is a mixture of finely washed Taixi anthracite and low-sulfur petroleum coke; the average particle size of the washed Taixi anthracite in the electric resistance material is larger than that of the low-sulfur petroleum coke;
laying a heat preservation material on the surface of the resistance material; wherein the heat-insulating material is finely washed Taixi anthracite; the heat-insulating material comprises an inner layer heat-insulating material and an outer layer heat-insulating material, the inner layer heat-insulating material and the outer layer heat-insulating material both adopt washed Taixi anthracite, and the granularity of the outer layer heat-insulating material is smaller than that of the inner layer heat-insulating material, so that the heat-insulating property of the outer layer heat-insulating material is superior to that of the inner layer heat-insulating material;
graphitization: the industrial high-voltage electricity is connected into a transformer for a silicon carbide furnace, the positive electrode and the negative electrode of direct current after transformation and rectification are respectively connected with the positive electrode and the negative electrode of a furnace body, and power transmission, temperature rise and graphitization are started.
2. The method for producing taixipu calcined coal and electric calcined coal using the graphitization waste heat replacement calciner as claimed in claim 1, wherein: the ratio of the low-sulfur petroleum coke to the washed Taixi anthracite is 6-7: 3-4.
3. The method for producing taixipu calcined coal and electric calcined coal using the graphitization waste heat replacement calciner as claimed in claim 1, wherein: and screening and separating the resistance material mixture graphitized by the furnace body to obtain the coal-series graphite and the oil-series graphite.
4. The method for producing taixipu calcined coal and electric calcined coal using the graphitization waste heat replacement calciner as claimed in claim 1, wherein: and a drainage layer is arranged between the resistance material and the heat insulation material, and the resistivity of the drainage layer is smaller than that of the resistance material and the heat insulation material and is used as a current passing area at the initial stage of power transmission and temperature rise.
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| CN111498840A (en) * | 2020-04-26 | 2020-08-07 | 国家电投集团宁夏能源铝业科技工程有限公司 | Process method for harmlessly treating electrolytic aluminum waste cathode carbon block by using resistance furnace |
| CN114455578A (en) * | 2022-01-21 | 2022-05-10 | 青岛瀚博电子科技有限公司 | Novel graphitization method for graphite negative electrode material of lithium ion battery |
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| GB2339888A (en) * | 1998-06-17 | 2000-02-09 | Rustec Ltd | Induction furnace |
| CN1847145A (en) * | 2004-12-15 | 2006-10-18 | Sgl碳股份公司 | Durable graphite bodies and method for their production |
| CN103964423A (en) * | 2014-05-04 | 2014-08-06 | 郴州市三晶科贸有限公司 | Production method of artificial graphite cathode materials in manner of inner tandem graphitization and graphitization furnace |
| CN106082189A (en) * | 2016-06-13 | 2016-11-09 | 邓华强 | Utilize the method that silicon carbide furnace transformator and resistance furnace produce graphitized material |
| CN205933244U (en) * | 2016-07-27 | 2017-02-08 | 洛阳联创锂能科技有限公司 | Continuous graphitizing furnace of battery anode material |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2339888A (en) * | 1998-06-17 | 2000-02-09 | Rustec Ltd | Induction furnace |
| CN1847145A (en) * | 2004-12-15 | 2006-10-18 | Sgl碳股份公司 | Durable graphite bodies and method for their production |
| CN103964423A (en) * | 2014-05-04 | 2014-08-06 | 郴州市三晶科贸有限公司 | Production method of artificial graphite cathode materials in manner of inner tandem graphitization and graphitization furnace |
| CN106082189A (en) * | 2016-06-13 | 2016-11-09 | 邓华强 | Utilize the method that silicon carbide furnace transformator and resistance furnace produce graphitized material |
| CN205933244U (en) * | 2016-07-27 | 2017-02-08 | 洛阳联创锂能科技有限公司 | Continuous graphitizing furnace of battery anode material |
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